Rotary motor.



N0.84?075.A PATBNTBD mm, 1907. A.A.DARBY.

l ROTARY MOTOR.

APPLIOATION FILED JUNE 14. 1906.

2 SHEETS-SHEET 1.

nl: Nomws PETERS co4, WASHINGTON, uA c.

A. A. DARBY.

ROTARY MOTOR. APPLIGATION FILED JUNE 14. 1906.

2 SHEETS-SHEET 2.

NoRRrs PETERS co., WASHING-ran, D. c.

AVERNO A. DARBY, OF VIDALIA, GEORGIA.

ROTARY MOTOR.

Specification of Letters Patent.

Patented Feb. 5, 1907.

Application filed Juno 14, 1906. Serial Non 321,757.

To all whom, t may concern.-

Be it known that I, AvERNo A. DARBY, a citizen of the United States,residing at Vidalia, in the county of Toombs and State of Georgia, haveinvented new and useful Improvements in Rotary Motors, of which thefollowing is a specification.

This invention relates to rotary motors, and embodies in itsorganization a rotary drive or motor Wheel of hollow formation journaledon a fixed shaft and containing a pair of opposed cy'linders carryingreciprocating pistons having pitman connections with the shaft andadapted in operation to drive the motor-wheel, which in turn operates apower-transmitting belt, there being connected with the cylinderssuitable inlet and exhaust ducts for supplying` a motive fluid to andexhausting it from the cylinders for operating the pistons.

The invention has for its objects to provide a comparatively simpleinexpensive device of this character wherein a maximum driving forcerelative to a given expenditure of energy is attained, one in which thepistons will move in unison and simultaneously on their inward andoutward strokes, thereby opposing their force to thus minimizevibrations of and properly counterbalance the motor-Wheel, and onewherein'stoppage of the Wheel on a dead-center is obviated.

A further object of the invention is to provide a device of thischaracter wherein the direction of movement of the motor-wheel may bereadily reversed, and this without reversing the points of admission ofthe fluid to the cylinders, one in which the use of slide-valves forcontrolling the ingress and egress of the fluid to and from thecylinders is rendered unnecessary, and one wherein the admission of thefluid to the cylinders for controlling the movements of the wheel pastthe dead-center may be governed at will.

With these and other objects in view the invention comprises the novelfeatures of construction and combination of parts, more fullyhereinafter described.

In the accompanying drawings, Figure 1"is a vertical transverse sectiontaken through the motor on a line centrally of the shaft. Fig. 2 is aside elevation, partly in section, the section being taken on the line 22 of Fig. 1. Fig. 3 is a detail sectional view taken through thereversing mechanism on the line 3 3 of Fig. 1.

Referring to the drawings, 1 designates a motor-wheel in the form of ahollow beltpulley having side walls 2 3, provided withoutwardly-extending conical tubular hubs 4 5, through which there isextended a crankshaft 6, having reversely-disposed crank portions 7,located within the wheel 1, said shaft being fixed against rotation inbearing-boxes 8, provided at the upper ends of standards 9, xed at theirlower ends to and arising vertically from a base 10, while arranged onthe shaft within the hubs 4 are tubular bushingsleeves 11, preferablycomposed of brass.

Fixed at diametrically opposite points within the motor-wheel 1 is apair of cylinders 12, containing reciprocatory pistons 13, the rods 14of which are connected by pitmen 15, respectively, with the crankportions 7 of the shaft, which, it will be noted, is so fixed that thecrank portions '7 are disposed on a line pitched diagonally to thevertical axis of the Wheel and constituting the dead-center of thelatter, as will more fully hereinafter appear, there being provided atthe rear ends of the cylinders 12 ports 16 and at their forward endsports 17, through which ports the motive fluid is alternately admittedat opposite sides of the pistons.

'Fitted on the hub 5 is a box 18, fixed against movement by means of anarm 19, attached to the adjacent standard 9, and having a tubular neck20, in which is coupled one end of a supply-pipe 21, there beingextended from the neck 2O and int the box a pair of divergent inletpassages or ports 22, and with an exhaust passage or port 23 in which iscoupled one end of an exhaust-pipe 24, there being formed atdiametrically opposite points in the hub 5 a pair of passages 25 26, ofwhich the former communicates with a pair of ducts 27, formed throughthe wall 3 and arranged to communicate, respectively, with the ports 16at the rear ends of the cylinders, while the passage 26 in like mannercommunicates with a pair of ducts 28, leading to and communicating,respectively, with the ports 17 for admitting iiuid to the forward endsof the cylinders.

Pivoted in the neck 2O at the juncture of the passages 22 and forcontrolling communication thereof with the inlet is a semicircularreversing-valve 29 having an outwardly-projecting stem 30, on which isfixed an operating-lever 31, while tapped onto the outer end of the hub5 and for movement therewith is a circular nut 32, containing aspring-pressed packing-gasket 33, designed to bear on the adjacent faceof the box 18, between which and the hub 5 there are arrangedpacking-gaskets 34, fitted in suitable grooves in the hub and atopposite sides of the passages 25 26.

Thenut 32, which rotates with the wheel 1, may receive a belt foroperating a governor, (not shown,) which in practice will be of suitableform and preferably sustained on the inlet-pipe 21, it being understoodin this connection that the wheel 1 receives a powertransmitting belt,(not shown) and through the medium of which the motor is connected withthe mechanism to be driven.

In practice, supposing the parts to be in the position seen in Figs. 1and 2, steam or other motive duidl will be admitted through pipe 21 andenter through one or the other of the by-passes 22 to the passage 25 andthence through the passages or ducts 27 to the rear ends of thecylinders 12 for driving the pistons 13 forwardly. As the pistons moveforward they act upon the crank portions 7 of the shaft 6 as fixedabutments, thereby causing rotation of the wheel 1 in the directionindicated by the arrow in Fig. 2, it being noted that during outstrokeof the pistons fluid will be exhausted therefrom through the passages 28to the passage 23, and thence through exhaust-pipe 24. On the outstrokeof the piston the wheel 2 makes a half-revolution, thereby bringing thepassage 26 into register with the inlet 22 and the passage 25 likewiseinto register with exhaust-passage 23, whereupon steam will `be admittedthrough ducts 28 and ports 17 to the forward end of the cylinders forimparting an instroke to the pistons, the pre viously-taken fluid being,under these conditions, exhausted in rear of the pistons through theports 16 and ducts 27, it being observed that during instroke of thepistons the wheel will be carried throughout the remainder of itscomplete revolution, and,

further, that at the completion of this revolution of the wheel it willhave passed beyond the dead-center line indicated by the line of pitchof the crank portions 7. In order to reverse the direction of rotationof wheel 1, the valve 29 is changed from the position shown in Fig. 3 toa position for closing the other by-pass 22, whereby the motive fluidwill be admitted to the passages 25 or 26, as the case may be, prior tothe wheel passing beyond the dead-center or, that is, before the activestrokes of the pistons 13 are completed, thereby shortening such strokeof the pistons and causing them to start upon the reverse stroke forcarrying the wheel in a re` verse direction. In other words, the fluidis admitted to the cylinders either before or after the wheel 1 haspassed the dead-center line, and if before such line has been reachedthe direction in which the wheel is rotating will obviously be reversed.It will be observed that in the operation of the device the `pistonswill move in unison on both the in and out strokes to thus oppose theirforces for relieving vibration of the wheel and for properly.counterbalancing the latter, and, furthermore, that under the simplifiedreversing mechanism herein provided the necessity for employingslide-valves on the cylinders is obviated.

Having thus described my invention, what I claim is- 1. In a motor ofthe type described, a rotary motor-wheel, a fixed abutment on which thewheel is -iournaled, a pair of opposed cylinders fixed in the wheel andcontaining reciprocatory pistons, connections between said pistons andthe abutment, the pistons being adapted to stroke inwardly and outwardlyin unison during reciprocation, and means for admitting a motive iiuidsimultaneously to corresponding ends of the pair of cylinders.

2. In a motor of the type described, a fixed shaft havingreversely-disposed crank portions, a motor-wheel journaled for rotationon the shaft, oppositely-disposed cylinders fixed to the wheel,pistons'arranged for reciprocation in said cylinders and adapted tostroke inwardly and outwardly in unison, connections between the pistonsand respective crank portions of the shaft, and means for admitting amotive iiuid simultaneously to corresponding ends of the pair ofcylinders.

3. In a motor of the type described, a fixed shaft havingreverselyedisposed crank portions, a motor-wheel journaled for rotationon the shaft, cylinders fixed at opposite points to the wheel, pistonsarranged for reciprocation in the cylinders and adapted to strokeinwardly and outwardly in unison, connections between the pistons andrespective crank portions and means for admitting a motive Huidalternately to opposite ends ol the cylinders, the fluid being admittedsimultaneously to corresponding ends of the pair of cylinders.

4. In a motor of the type described, a fixed shaft havingreversely-disposed crank portions, a motor-wheel journaled for rotationon the shaft, a pair of opposed cylinders fixed to the wheel, pistonsdisposed for reciprocation in the cylinders and arranged to stroke inunison, means for admitting a motive fluid alternately to opposite endsof the cylinders and a reversing-valve for controlling the admissionofthe iuid to the cylinders in accord with the' position of the wheelrelative to its dead-center.

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5. In a motor ofthe type desoribed,a fixed to the cylinders in accordWith the position abutment, a rotary motor-Wheel journaled of the Wheelrelative to its dead-center. [o thereon, a pair of opposed cylindersfixed on In testimony whereof I afix my signature the Wheel andcontaining reoiprooatory pisin presence of tWo Witnesses.

tons designed to stroke in unison, means for AVERNO A. DARBY. admittinga motive Huid alternately to op- Witnesses: posite ends of thecylinders, and means for JOHN L. FLETCHER7 governing the time ofadmission of the Huid K. ALLEN.

